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[Chemical Knowledge]：What is the molecular weight

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When we talk about chemistry and chemical reactions, molecular weight is a very important concept. So, what is molecular weight? It refers to the sum of the masses of the atoms in a molecule, that is, molecular weight is the sum of the relative molecular masses of the atoms of a chemical element in a molecule. The calculation of the molecular weight of the

relies on atomic mass tables. Each element on the atomic mass table has a relative atomic mass or relative atomic mass, which is the average mass of all isotopes of that element. For example, the atomic mass of carbon is 12.01, which means that the relative atomic mass of one carbon atom is 12.01.

want to calculate the molecular weight of a substance, we need to add the relative atomic masses of all atoms. For example, when we want to know the molecular weight of a molecule of oxygen (O2), we can add the relative atomic masses (each 16.00) of two oxygen atoms. This will give us a molecule of oxygen with a molecular weight of 32.00.

understand molecular weight is very important because it can help us predict the interaction of different substances in chemical reactions. For example, in many chemical reactions, atoms and molecules must appear in a certain proportion in the reaction. Knowing the molecular weight of each substance allows us to more accurately calculate the amount of reactants to be prepared.

In many laboratory and industrial settings, one needs to accurately determine the molecular weight of a compound. This can be achieved with modern equipment such as time-of-flight mass spectrometers. The time-of-flight mass spectrometer can quickly and accurately determine the mass of a compound, and then calculate the molecular number of the compound by calculating the applicable molecular weight.

we can define molecular weight as the sum of the relative atomic masses of all the atoms in a molecule. Understanding molecular weight is important for predicting and calculating chemical reactions, and it is necessary for many areas of modern science.

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